add documentation on contribution analytics

doc/README.md

@@ -12,6 +12,7 @@
 - [Profile Settings](profile/README.md)
 - [Project Services](project_services/project_services.md) Integrate a project with external services, such as CI and chat.
 - [Public access](public_access/public_access.md) Learn how you can allow public and internal access to projects.
+- [Analytics](analytics/README.md)
 - [SSH](ssh/README.md) Setup your ssh keys and deploy keys for secure access to your projects.
 - [Web hooks](web_hooks/web_hooks.md) Let GitLab notify you when new code has been pushed to your project.
 - [Workflow](workflow/README.md) Using GitLab functionality and importing projects from GitHub and SVN.

doc/analytics/README.md

+# Analytics
+
+- [Contribution Analytics](contribution_analytics.md)

doc/analytics/contribution_analytics.md

+# Contribution Analytics (EE only)
+
+In order to make it easy to see how and where are active in your projects,
+we’re building contribution analytics for GitLab Enterprise Edition.
+
+In GitLab 8.3, you can now quickly get an overview of activity of a group by going to **Group -> Contribution Analytics** at `/groups/groupname/analytics`.
+
+![See Contribution Analytics in GitLab EE 8.3 and up](group_stats.jpg)